docs: def assert_greater(first, second, msg_fmt="{msg}"):
      """Fail if first is not greater than second.
  
      >>> assert_greater('foo', 'bar')
      >>> assert_greater(5, 5)
      Traceback (most recent call last):
          ...
      AssertionError: 5 is not greater than 5
  
      The following msg_fmt arguments are supported:
      * msg - the default error message
      * first - the first argument
      * second - the second argument
      """
  
      if not first > second:
          msg = "{!r} is not greater than {!r}".format(first, second)
          fail(msg_fmt.format(msg=msg, first=first, second=second))